devo 10 battery too low

Hi all,

Sorry for a long winded first post...

I have been lurking here for a long while now. I have had my devo 10 for over 1 year and is working well flying all mine dsm stuff without issue.

I am running 4.01 firmware.

I have done a couple of mods the last 2 weeks -- it was stock hardware wise prior.

1) Instead of the 8 cell AA holder, I built 6 cells from enloops. I have set my low voltage alarm to 6.6 volts.

2) yesterday, I finally got the balls to add the NFR24L01 module. I read the pin out wrong the first time and reversed the soldering points... after some fiddling, I realized my mistake and resolder the points that were incorrect (just the part under the RF socket -- the 3 wires). I was able to bind to my v202 after.

So, my current issue is that today, I start to get "battery too low, can't save" message every time I turn on the TX.

The voltage read out from TX from my 6 enloop cell pack is ~7.45V which is greater than the 6.6V I had set.

Does anyone know if adding module will cause this or did I foobared something while adding the module? I am not the best solderer... but I had many practice and the joins actually look fairly nice IMHO.

I have done some flying after the 6 cell AA mod since I also got a ncpx around the same time so I know I did not experience this right after going to 6 cells.

I did lots of searches but can't seem to find topic to this.

any help appreciated.

Thanks

I doubt the alarm has anything to do with the voltage measurement on powerup. Did you try using 8 cells and see if you still get the message? You may simply be putting too low a voltage into the TX.

Thank you for your feedback. Let me answer the question before I forget... using the original 8 cell AA rechargeable, the message does go away. I put TX on charge last night; I just checked, the 6 cell settled at 8.35V and I am also not getting the battery low message.

I was under the impression since I am using deviation, the "low battery" is controlled via software. I could never find a definitive minimum operating voltage for devo 10 and was hoping I can save some weight by going 6 cell. I see other devos like the 8 and the 12 can run at much lower voltage and was hoping the 10 can do the same.

I don't understand how can hardware trigger low battery message when the software is set to check against 6.6V. I figure the TX will just turn off if not enough voltage is supplied.

I will run this pack down to 7.5V or so and check... looks like there is hard coded check against 7.5V in my situation.

thanks

Eight empty NiMH cells are...8V. If it is controlled by hardware, you will have no chance to go further down , you only waste possible operating time.

Thank you everyone for your insights. vlad_vy hit the nail on the head. I read a few posts regarding "batt_critical" on the 7e but was never able to find it on the 10 menu... I figured it must be a 7e thing. Thank you vlad_vy for pointing out the tx.ini file.

I just checked, it is indeed set at 7500... That's why I see the message when the TX batt is down to 7.45V even though the alarm is set at 6600. I will updated to 6000 just to give me some headroom. As is, the TX reading is .2V off compared to my meter so 6000 is actually 6200 on the battery.

I just checked with a fairly dead 2S LIPO that is registering @6.9V and I was able to make changes and it saved on power off.

Thank you everyone for your help.